iindeximperatival./im-per-uh-tahy-vuhl/US // ɪmˌpɛr əˈtaɪ vəl //势在必行,势在必得,势在必得的,势在必行的Definitionsadj.adjective · 形容词1.›of, relating to, or characteristic of the grammatical imperative. Level 5More words in i →